21010000203 has 12 divisors (see below), whose sum is σ = 30398281368. Its totient is φ = 13983357600.

The previous prime is 21010000199. The next prime is 21010000217. The reversal of 21010000203 is 30200001012.

It is a happy number.

It is not a de Polignac number, because 21010000203 - 2² = 21010000199 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21010000223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1936725 + ... + 1947542.

It is an arithmetic number, because the mean of its divisors is an integer number (2533190114).

Almost surely, 2^21010000203 is an apocalyptic number.

21010000203 is a deficient number, since it is larger than the sum of its proper divisors (9388281165).

21010000203 is a wasteful number, since it uses less digits than its factorization.

21010000203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3884874 (or 3884871 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21010000203 its reverse (30200001012), we get a palindrome (51210001215).

The spelling of 21010000203 in words is "twenty-one billion, ten million, two hundred three", and thus it is an aban number.